/**
 * SDK PDF Export
 * Generates PDF compliance reports from SDK state
 */

import jsPDF from 'jspdf'
import { SDKState, SDK_STEPS } from './types'

// =============================================================================
// TYPES
// =============================================================================

export interface ExportOptions {
  includeEvidence?: boolean
  includeDocuments?: boolean
  includeRawData?: boolean
  language?: 'de' | 'en'
}

export const DEFAULT_OPTIONS: ExportOptions = {
  includeEvidence: true,
  includeDocuments: true,
  includeRawData: true,
  language: 'de',
}

// =============================================================================
// LABELS (German)
// =============================================================================

export const LABELS_DE = {
  title: 'AI Compliance SDK - Export',
  subtitle: 'Compliance-Dokumentation',
  generatedAt: 'Generiert am',
  page: 'Seite',
  summary: 'Zusammenfassung',
  progress: 'Fortschritt',
  phase1: 'Phase 1: Automatisches Compliance Assessment',
  phase2: 'Phase 2: Dokumentengenerierung',
  useCases: 'Use Cases',
  risks: 'Risiken',
  controls: 'Controls',
  requirements: 'Anforderungen',
  modules: 'Compliance-Module',
  evidence: 'Nachweise',
  checkpoints: 'Checkpoints',
  noData: 'Keine Daten vorhanden',
  status: 'Status',
  completed: 'Abgeschlossen',
  pending: 'Ausstehend',
  inProgress: 'In Bearbeitung',
  severity: 'Schweregrad',
  mitigation: 'Mitigation',
  description: 'Beschreibung',
  category: 'Kategorie',
  implementation: 'Implementierung',
}

// =============================================================================
// HELPERS
// =============================================================================

export function formatDate(date: Date | string | undefined): string {
  if (!date) return '-'
  const d = typeof date === 'string' ? new Date(date) : date
  return d.toLocaleDateString('de-DE', {
    day: '2-digit',
    month: '2-digit',
    year: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
  })
}

function addHeader(doc: jsPDF, title: string, pageNum: number, totalPages: number): void {
  const pageWidth = doc.internal.pageSize.getWidth()
  doc.setDrawColor(147, 51, 234)
  doc.setLineWidth(0.5)
  doc.line(20, 15, pageWidth - 20, 15)
  doc.setFontSize(10)
  doc.setTextColor(100)
  doc.text(title, 20, 12)
  doc.text(`${LABELS_DE.page} ${pageNum}/${totalPages}`, pageWidth - 40, 12)
}

function addFooter(doc: jsPDF, state: SDKState): void {
  const pageWidth = doc.internal.pageSize.getWidth()
  const pageHeight = doc.internal.pageSize.getHeight()
  doc.setDrawColor(200)
  doc.setLineWidth(0.3)
  doc.line(20, pageHeight - 15, pageWidth - 20, pageHeight - 15)
  doc.setFontSize(8)
  doc.setTextColor(150)
  doc.text(`Tenant: ${state.tenantId} | ${LABELS_DE.generatedAt}: ${formatDate(new Date())}`, 20, pageHeight - 10)
}

function addSectionTitle(doc: jsPDF, title: string, y: number): number {
  doc.setFontSize(14)
  doc.setTextColor(147, 51, 234)
  doc.setFont('helvetica', 'bold')
  doc.text(title, 20, y)
  doc.setFont('helvetica', 'normal')
  return y + 10
}

function addSubsectionTitle(doc: jsPDF, title: string, y: number): number {
  doc.setFontSize(11)
  doc.setTextColor(60)
  doc.setFont('helvetica', 'bold')
  doc.text(title, 25, y)
  doc.setFont('helvetica', 'normal')
  return y + 7
}

function addText(doc: jsPDF, text: string, x: number, y: number, maxWidth: number = 170): number {
  doc.setFontSize(10)
  doc.setTextColor(60)
  const lines = doc.splitTextToSize(text, maxWidth)
  doc.text(lines, x, y)
  return y + lines.length * 5
}

function checkPageBreak(doc: jsPDF, y: number, requiredSpace: number = 40): number {
  const pageHeight = doc.internal.pageSize.getHeight()
  if (y + requiredSpace > pageHeight - 25) {
    doc.addPage()
    return 30
  }
  return y
}

// =============================================================================
// PDF EXPORT
// =============================================================================

export async function exportToPDF(state: SDKState, options: ExportOptions = {}): Promise<Blob> {
  const doc = new jsPDF()

  let y = 30
  const pageWidth = doc.internal.pageSize.getWidth()

  // Title Page
  doc.setFillColor(147, 51, 234)
  doc.rect(0, 0, pageWidth, 60, 'F')
  doc.setFontSize(24)
  doc.setTextColor(255)
  doc.setFont('helvetica', 'bold')
  doc.text(LABELS_DE.title, 20, 35)
  doc.setFontSize(14)
  doc.setFont('helvetica', 'normal')
  doc.text(LABELS_DE.subtitle, 20, 48)

  y = 80
  doc.setDrawColor(200)
  doc.setFillColor(249, 250, 251)
  doc.roundedRect(20, y, pageWidth - 40, 50, 3, 3, 'FD')

  y += 15
  doc.setFontSize(12)
  doc.setTextColor(60)
  doc.text(`${LABELS_DE.generatedAt}: ${formatDate(new Date())}`, 30, y)
  y += 10
  doc.text(`Tenant ID: ${state.tenantId}`, 30, y)
  y += 10
  doc.text(`Version: ${state.version}`, 30, y)
  y += 10
  const completedSteps = state.completedSteps.length
  const totalSteps = SDK_STEPS.length
  doc.text(`${LABELS_DE.progress}: ${completedSteps}/${totalSteps} Schritte (${Math.round(completedSteps / totalSteps * 100)}%)`, 30, y)

  y += 30
  y = addSectionTitle(doc, 'Inhaltsverzeichnis', y)

  const tocItems = [
    { title: 'Zusammenfassung', page: 2 },
    { title: 'Phase 1: Compliance Assessment', page: 3 },
    { title: 'Phase 2: Dokumentengenerierung', page: 4 },
    { title: 'Risiken & Controls', page: 5 },
    { title: 'Checkpoints', page: 6 },
  ]

  doc.setFontSize(10)
  doc.setTextColor(80)
  tocItems.forEach((item, idx) => {
    doc.text(`${idx + 1}. ${item.title}`, 25, y)
    doc.text(`${item.page}`, pageWidth - 30, y, { align: 'right' })
    y += 7
  })

  // Summary Page
  doc.addPage()
  y = 30
  y = addSectionTitle(doc, LABELS_DE.summary, y)

  doc.setFillColor(249, 250, 251)
  doc.roundedRect(20, y, pageWidth - 40, 40, 3, 3, 'F')
  y += 15
  const phase1Steps = SDK_STEPS.filter(s => s.phase === 1)
  const phase2Steps = SDK_STEPS.filter(s => s.phase === 2)
  const phase1Completed = phase1Steps.filter(s => state.completedSteps.includes(s.id)).length
  const phase2Completed = phase2Steps.filter(s => state.completedSteps.includes(s.id)).length

  doc.setFontSize(10)
  doc.setTextColor(60)
  doc.text(`${LABELS_DE.phase1}: ${phase1Completed}/${phase1Steps.length} ${LABELS_DE.completed}`, 30, y)
  y += 8
  doc.text(`${LABELS_DE.phase2}: ${phase2Completed}/${phase2Steps.length} ${LABELS_DE.completed}`, 30, y)
  y += 25

  y = addSubsectionTitle(doc, 'Kennzahlen', y)
  const metrics = [
    { label: 'Use Cases', value: state.useCases.length },
    { label: 'Risiken identifiziert', value: state.risks.length },
    { label: 'Controls definiert', value: state.controls.length },
    { label: 'Anforderungen', value: state.requirements.length },
    { label: 'Nachweise', value: state.evidence.length },
  ]
  metrics.forEach(metric => {
    doc.text(`${metric.label}: ${metric.value}`, 30, y)
    y += 7
  })

  // Use Cases
  y += 10
  y = checkPageBreak(doc, y)
  y = addSectionTitle(doc, LABELS_DE.useCases, y)

  if (state.useCases.length === 0) {
    y = addText(doc, LABELS_DE.noData, 25, y)
  } else {
    state.useCases.forEach((uc, idx) => {
      y = checkPageBreak(doc, y, 50)
      doc.setFillColor(249, 250, 251)
      doc.roundedRect(20, y - 5, pageWidth - 40, 35, 2, 2, 'F')
      doc.setFontSize(11)
      doc.setTextColor(40)
      doc.setFont('helvetica', 'bold')
      doc.text(`${idx + 1}. ${uc.name}`, 25, y + 5)
      doc.setFont('helvetica', 'normal')
      doc.setFontSize(9)
      doc.setTextColor(100)
      const ucStatus = uc.stepsCompleted === uc.steps.length ? LABELS_DE.completed : `${uc.stepsCompleted}/${uc.steps.length} Schritte`
      doc.text(`ID: ${uc.id} | ${LABELS_DE.status}: ${ucStatus}`, 25, y + 13)
      if (uc.description) {
        y = addText(doc, uc.description, 25, y + 21, 160)
      }
      y += 40
    })
  }

  // Risks
  doc.addPage()
  y = 30
  y = addSectionTitle(doc, LABELS_DE.risks, y)

  if (state.risks.length === 0) {
    y = addText(doc, LABELS_DE.noData, 25, y)
  } else {
    const sortedRisks = [...state.risks].sort((a, b) => {
      const order = { CRITICAL: 0, HIGH: 1, MEDIUM: 2, LOW: 3 }
      return (order[a.severity] || 4) - (order[b.severity] || 4)
    })
    sortedRisks.forEach((risk, idx) => {
      y = checkPageBreak(doc, y, 45)
      const severityColors: Record<string, [number, number, number]> = {
        CRITICAL: [220, 38, 38], HIGH: [234, 88, 12],
        MEDIUM: [234, 179, 8], LOW: [34, 197, 94],
      }
      const color = severityColors[risk.severity] || [100, 100, 100]
      doc.setFillColor(color[0], color[1], color[2])
      doc.rect(20, y - 3, 3, 30, 'F')
      doc.setFontSize(11)
      doc.setTextColor(40)
      doc.setFont('helvetica', 'bold')
      doc.text(`${idx + 1}. ${risk.title}`, 28, y + 5)
      doc.setFont('helvetica', 'normal')
      doc.setFontSize(9)
      doc.setTextColor(100)
      doc.text(`${LABELS_DE.severity}: ${risk.severity} | ${LABELS_DE.category}: ${risk.category}`, 28, y + 13)
      if (risk.description) {
        y = addText(doc, risk.description, 28, y + 21, 155)
      }
      if (risk.mitigation && risk.mitigation.length > 0) {
        y += 5
        doc.setFontSize(9)
        doc.setTextColor(34, 197, 94)
        doc.text(`${LABELS_DE.mitigation}: ${risk.mitigation.join(', ')}`, 28, y)
      }
      y += 15
    })
  }

  // Controls
  doc.addPage()
  y = 30
  y = addSectionTitle(doc, LABELS_DE.controls, y)

  if (state.controls.length === 0) {
    y = addText(doc, LABELS_DE.noData, 25, y)
  } else {
    state.controls.forEach((ctrl, idx) => {
      y = checkPageBreak(doc, y, 35)
      doc.setFillColor(249, 250, 251)
      doc.roundedRect(20, y - 5, pageWidth - 40, 28, 2, 2, 'F')
      doc.setFontSize(10)
      doc.setTextColor(40)
      doc.setFont('helvetica', 'bold')
      doc.text(`${idx + 1}. ${ctrl.name}`, 25, y + 5)
      doc.setFont('helvetica', 'normal')
      doc.setFontSize(9)
      doc.setTextColor(100)
      doc.text(`${LABELS_DE.category}: ${ctrl.category} | ${LABELS_DE.implementation}: ${ctrl.implementationStatus || 'Nicht definiert'}`, 25, y + 13)
      if (ctrl.description) {
        y = addText(doc, ctrl.description.substring(0, 150) + (ctrl.description.length > 150 ? '...' : ''), 25, y + 20, 160)
      }
      y += 35
    })
  }

  // Checkpoints
  doc.addPage()
  y = 30
  y = addSectionTitle(doc, LABELS_DE.checkpoints, y)

  const checkpointIds = Object.keys(state.checkpoints)
  if (checkpointIds.length === 0) {
    y = addText(doc, LABELS_DE.noData, 25, y)
  } else {
    checkpointIds.forEach((cpId) => {
      const cp = state.checkpoints[cpId]
      y = checkPageBreak(doc, y, 25)
      const statusColor = cp.passed ? [34, 197, 94] : [220, 38, 38]
      doc.setFillColor(statusColor[0], statusColor[1], statusColor[2])
      doc.circle(25, y + 2, 3, 'F')
      doc.setFontSize(10)
      doc.setTextColor(40)
      doc.text(cpId, 35, y + 5)
      doc.setFontSize(9)
      doc.setTextColor(100)
      doc.text(`${LABELS_DE.status}: ${cp.passed ? LABELS_DE.completed : LABELS_DE.pending}`, 35, y + 12)
      if (cp.errors && cp.errors.length > 0) {
        doc.setTextColor(220, 38, 38)
        doc.text(`Fehler: ${cp.errors.map(e => e.message).join(', ')}`, 35, y + 19)
        y += 7
      }
      y += 20
    })
  }

  // Add page numbers
  const pageCount = doc.getNumberOfPages()
  for (let i = 1; i <= pageCount; i++) {
    doc.setPage(i)
    if (i > 1) {
      addHeader(doc, LABELS_DE.title, i, pageCount)
    }
    addFooter(doc, state)
  }

  return doc.output('blob')
}